Blowtorch



C. H. ALLEN AND J. B. ANDERSON.

BLOWTORCH.

APPLICATION FILED AUG.5, 1920.

1,390,265, PatentedSept. 13, 1921.

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(72min fl/l/lzn qnd J5me; Efinderson C. H. ALLEN AND J. B. ANDERSON. BLOWTORCH. APPLICATION FILED AUG.5, 1920.

1,390,265. Patentedsept- 13,1921.

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CHARLES H. ALLEN AND JAMES B. ANDERSON, OF PITTSBURGH, PENNSYLVANIA.

IBLOWTORCH.

Specification of Letters Patent.

Patented Sept. 13, 11921.

To all whom it may concern:

Be it known that we, CHARLES H. ALLEN and JAMns B. ANDERSON, citizens of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Blou torches, of which the following is a specification.

This invention relates to blow-torches, and more particularly to a torch adapted for utilizing liquefied gas as fuel.

One of the main objects of the invention is to provide a torch so constructed as to enable the use of fuel in either gaseous or liquid form, as desired.

Figure 1 is a central vertical sectional View through a torch constructed in accordance with our invention, parts being shown in elevation.

Fig. 2 is a view the handle.

Fig. 3 is a fragmental sectional view through the standard and associated parts.

Fig. 4: is a front view of the main burner and pilot burner casin Fig. 5 is a section through the same.

Referring to Figs. 1 and 8, the tank 1 is provided with an opening through its top wall through which is secured, in any preferred or suitable manner a cylindrical standard 2 provided with two ducts 3 and t extending approximately one-third of the length of the standard. These. duct-s communicate, at their upper ends, with a. main duct 5 extending axially of thestandard, suitable valves 6 and 7 being provided for partly in section through controlling communication between this mam duct and the auxiliary ducts 3 and 4, respectively.

A main burner 8 is secured in the standard and communicates with duct 5 at the upper end thereof, a pilot burner 9 being positioned belowthe main burner and also in communication with this duct. This pilot burner is inclosed by a casing 10 depending from a perforated mixer or manifold 11 se cured to the standard and extending about the main burner Sin the known manner. An opening is provided through the top of casing 10, a suitable screen 12 being inserted in this opening, to permit lighting of the main burner from the pilot light of the pilot burner as will be understood.

he flQW of l u t 5 to burner 8 is controlled by a valve 13 threaded through a nipple 15 projecting from the standard and provided adjacent its outer end with a knurled wheel 16. This valve is of tubular construction to slidably receive a tubular member 17 open at its inner end and slidable through a packing gland 18 provided at the outer end of the valve. A knurled disk 19 is detachably secured to the outer end of member 17 by means of a central stem 20 threaded into the outer end of the same. This stem is provided with an axial. bore in. which is secured the outer end portion of a fine long cleaning wire or needle 21 the inner end of which is tapered to a fineJpoint so as to readily enter the opening of burner 8 the needle being disposed substantially coaxial with this opening as illustrated. lilovement of member 17 in either direction is limited by a pin 22 secured in valve 13, the inner end of this pin projecting into a groove. 23 in the outer face of member 17.

y reciprocating member 1'? the cleaning wire 21 may be caused to enter and effectually clean out and open the fuel. opening of burner 8 and, as the wire is much smaller than this opening this cleaning out of the fuel opening of burner 8 may be performer while the torch is in use without materially interfering with the amount of flame and heat produced. A valve and cleaning means similar to those described are provided for regulating the flow of fuel to, and cleaning, the pilot valve 9..

The bottom at oftank l is concaved to accommodate the head of a. plug threaded into a valve casing 26 seem-ed. through bottom 24 centrally thereof. This casing is provided with a web 27 which is centrally apertured and ground to provide a seat for a ball val ve 28 normally held seated by a coil spring 30 con lined between the valve and the false bottom 24, said false bottom being provided with a central aperture 32 through its top. A. valve casing 33 is secured through the top of the tank and is provided with a bore 3 through its lower end; this bore communicating with a valve chamber of suitable type 35 in which is mounted a ball valve 36 for i plug being secured in adjustment by a jamb nut 40 so as to vary the pressure exerte by the spring on the valve to suit conditions.

Tank 1 is provided with a suitable handle 42 the upper end of which is attached to the tank by a member 4&3. The lower end of the handle fits into a socket 44: carried by a tubular member 45 secured through the peripheral wall of the tank and provided with an axial duct 46 in its inner end portion. The outer end of this duct is normally closed by a valve 47 threaded into member 45 which is also provided with a radially eX- tending duct 4:8 communicating with the space as about the point 50 of the valve. By

opening the valve, the gas may be permitted to escape under pressure through duct 48. This provides means for readily determining if there is any gas in the tank, and also for determining if any of this gas is in liquid form so that the advisablity or necessity of renewing the supply of gas can be ascertained.

The tank 1 is provided with a false bottom 24-? which fits tightly about the upper end of valve casing 26, the space between the bottom 2e and false bottom 24 forming a gas chamber 51. A tube 52 has its lower end secured through false bottom 24*, the lower portion of this tube being provided with per-- forations 53. A thimble 54 is threaded upon the lower end of the tube and is provided with a central opening ground to provide a seat for reception of the point of a needle 55 which extends through the tube and is slidable through a packing gland 56 secured on the upper end of the tube which also extends through the top of the tank. A tube 57 is secured in one of the auxiliary ducts of standard 2 and communicates at its lower end with chamber 51, and a tube 41* is secured in the other auxiliary duct. By opening valve 55 the gas in liquid form may be permitted todrip into chamber 51 where it quickly becomes gaseous. The gas thus produced may be fed to the burner, by means of tube 57, and the liquefied gas or fuel may be supplied to the burners by means of tube 4L1, as will be understooc.

In practice, the gas in liquid form is introduced into the tank through valve casing 526, plug 25 being removed for this purpose and replaced when the desired amount 0 liquefied gas has flowed into the tank. By opening valve 7, valve 6 being closed, the gas in liquid form may be supplied to either one or both of the burners, as desired, an by reversing this operation the gas in its gaseous form may be supplied to the burners. To permit ready flow of the fuel to the main burner 8 in the event that the valve for the pilot burner is closed, duct 5 is provided with an enlargement or chamber 5 forming a bypass about the valve body, and a similar chamber 5 is provided at the upper end of the duct to accommodate the nose or point portion of Valve 18.

As suggested herein, there may be changes made in details of construction and arrangement of different parts of the invention without departing-from the field and scope of the same, and I intend to include all such variations, as fall within the scope of the appended claims, in this application in which a preferred form only of my invention is disclosed. a

hat we claim is 1. In a torch of the character described, a fuel tank provided with a double bottom; the fuel contained in said tank being in a liquid state in the upper chamber of said ta k and in a gaseous state in the lower chamber comprised within said double bottom.

2. In a torch of the character described, a fuel tank provided with a double bottom; the fuel contained in said tank being in a liquid state in the upper chamber of said tank and in a gaseous state in the lower chamber comprised within said double bottom and means to introduce liquid fuel from the upper chamber into said lower chamber.

8. In a torch of the character described, a fuel tank provided with a double bottom; the fuel contained in said tank being in a liquid state in the upper chamber of said tank and in gaseous state in the lower chamber comprised within said double bottom and adjustable means to introduce liquid fuel from the upper chamber into said tower chamber.

4-,. In a torch of the character described, a tank adapted to contain a liquefied fuel gas, and provided at its lower end with a gas chamber, means for permitting the liquefied gas to drip into said chamber so as to produce gas in gaseous form therein, a burner, and means for supplying fuel to said burner from said gas chamber or from within the body of the tank adjacent the bottom thereof, optionally.

5. In a torch of the character described, a tank provided with a double bottom, the upper part of said tank adapted to contain liquefied gas, means for permitting the liquefied gas to drip into said lower part of the tank, so as to produce gas in gaseous form therein, a burner, means supplying fuel to said burner from said gas chamber or from within the body of the tank adjacent d the bottom thereof, optionally and a self closing valve centrally located at the bottom of the tank.

In testimony tures. 1

CHARLES H. ALLEN. JAMES ANDERSON.

whereof we affix'our sigma 

